Improved example + minor code refactor

[nielslyngsoe]

Improved example to actually demonstrate how nested sorter controller can work in a infinite group situation.

Types of changes

As well this does a minor refactor of the Sorter Controller, while thinking about supporting ability to define a Handle Selector, but this is instead created as a task in the backlog.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Motivation and context

How to test?

Screenshots (if appropriate)

Checklist

• If my change requires a change to the documentation, I have updated the documentation in this pull request.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.